OSH Park
Shared projects
CTL122 (REV. A)
by
Stephanos.
2
layer board of
2.36x2.41
inches
(59.97x61.24
mm).
Shared on
August 24th, 2014 00:13.
Programmable PS/2-USB Converter
PIC18F4550
This board was designed to translate the non-standard IBM Model M 122-key Keyboard PS/2 scancode into the standard USB HID scancode.
Linear PSU 12V RevB
by
OnyxRobots.
2
layer board of
3.15x2.30
inches
(80.04x58.45
mm).
Shared on
August 23rd, 2014 19:46.
120V / 12V 1.4A PSU 2014-02-21
For a project where off-the-shelf switching power supplies all had too much coil whine, I designed this linear power supply. It is noise-less, and runs silently. It is designed to be plugged into mains, with proper creepage/clearance zones, but you have to use a separate fuse in the power entry module for the grounded box you should mount this in.
Output voltage is set by the R2/R1 divider; the transformer and application I use set this at 12.0V.
If you’re not comfortable designing for and working with mains voltage electronics, I recommend against trying this project.
UVLO RevC
by
OnyxRobots.
2
layer board of
2.00x1.50
inches
(50.80x38.13
mm).
Shared on
August 23rd, 2014 19:46.
LiPo low-voltage cut-off 2014-03-24
After destroying a LiPo battery when forgetting to turn off a LiPo powered Raspberry Pi device, I built this circuit. It features a soft-power-on switch based on a P-channel MOSFET, and a space for an ATTiny85 to monitor voltage and turn off when it’s too low.
I have built this and use it, and I additionally talk to the ATTiny85 using the SPI in the Raspberry Pi (without chip select) to report voltage to the host, and do soft-power-off on demand.
Firmware for the ATTiny85 obviously is important for this project to work right!
Onyx Switch A
by
OnyxRobots.
2
layer board of
1.90x1.10
inches
(48.29x27.94
mm).
Shared on
August 23rd, 2014 19:46.
20140420 P-channel Power Switch
This switch features pushbutton on and off action, as well as ability to actuate on and off through the 100-mil header. Power handling up to 20A, depending on specific P-channel MOSFET used and tolerance for board heat.
I have ordered, built, and tested this design, and it works well. Leakage current when off is below what I can measure – approximately equal to zero.
LM380 2x1W Amplifier
by
OnyxRobots.
2
layer board of
1.90x1.55
inches
(48.29x39.37
mm).
Shared on
August 23rd, 2014 19:45.
Revision A 2014-08-23